dhclient in ISC DHCP 3.0.x through 4.2.x before 4.2.1-P1, 3.1-ESV
before 3.1-ESV-R1, and 4.1-ESV before 4.1-ESV-R2 allows remote
attackers to execute arbitrary commands via shell metacharacters in a
hostname obtained from a DHCP message, as demonstrated by a hostname
that is provided to dhclient-script.
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